Surface-mounted waterproof junction box

The utility model provides a surface-mounted waterproof junction box which comprises a box body and a box cover connected to the box body. The box body is provided with a plurality of threading holes. A sealing piece made of an elastic material is connected to the threading hole and is used for sealing the threading hole; the sealing piece comprises at least two separation rings which are distributed in the axis direction of the sealing piece at intervals, the outer diameters of the separation rings are sequentially reduced, a radial protruding ring is arranged between every two adjacent separation rings, and the two ends of each radial protruding ring are connected with the opposite side walls of the corresponding two separation rings in a sealed mode respectively. When line pipes with different pipe diameter specifications are installed, the outer diameter of the line pipe is measured firstly, then the separating ring with the corresponding outer diameter on the sealing piece is cut off by a knife, and fina